Apparatus and method for biometric authentication
Abstract
A biometric authentication system includes: an image acquisition unit for acquiring an image of a living body; a light source with a predetermined wavelength band; an authentication information storage unit for, if light is emitted by the light source, setting a predetermined distance for a first distance to a first image acquired by the image acquisition unit in a depth direction so that quality of the first image is improved, extracting a first feature to be used to perform biometric authentication from the first image whose quality has been improved, and storing authentication information regarding the first feature; a feature extraction unit for, if light is emitted by the light source when performing authentication, setting the predetermined distance for a second distance to a second image acquired by the image acquisition unit in the depth direction so that quality of the second image is improved, and extracting a second feature for biometric authentication from the second image whose quality has been improved; and a comparison unit for comparing the authentication information regarding the first feature and authentication information regarding the second feature.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1. A biometric authentication system, comprising:
an image sensor acquiring an image of a living body;
a first light source that irradiates a first light to the living body;
a second light source that irradiates a second light to the living body;
an authentication information storage unit storing a first distance and a second distance;
a feature extraction unit extracting a biological information from the image of the living body, and
a determination unit configured to determine the go/no-go of biometric authentication according to a result of a comparison between the extracted biological information and stored template data,
wherein
the biometric authentication system is configured to improve the biological information by performing a deconvolution process,
when the biological information is about a vein, the first light is irradiated and the first distance is used in the deconvolution process, and
when the biological information is about a artery, the second light is irradiated and the second distance is used in the deconvolution process;
wherein the deconvolution process uses a point spread function which is a circular symmetric function of distance from a z axis on the living body and is derived from the following equation:
P
(
ρ
)
=
3
P
o
(
4
π
)
2
{
(
μ
s
′
+
μ
o
)
+
(
k
o
+
1
ρ
2
+
d
2
)
d
ρ
2
+
d
2
}
exp
(
-
k
d
ρ
2
+
d
2
)
ρ
2
+
d
2
.
2. The biometric authentication system according to claim 1 , wherein
a wavelength of the second light is longer than a wavelength of the first light.
3. The biometric authentication system according to claim 2 , where in the wavelength of the second light is longer than 800 nm.
4. The biometric authentication system according to claim 1 , wherein
the first distance and the second distance are each a distance from a skin in the depth direction.
5. A method for performing biometric authentication, comprising:
extracting biological information of a vein comprising the steps of
irradiating a first light to a living body,
acquiring a image of the living body by reflection of the first light and scattering the first light,
extracting the biological information from the image by a deconvolution process using a first distance; and
determining the go/no-go of biometric authentication according to the result of a comparison between the extracted biological information and stored template data,
extracting the biological information of a artery comprising the steps of,
irradiating a second light to the living body,
acquiring the image of the living body by reflection of the second light and scattering the second light, and
extracting the biological information from the image by the deconvolution process using a second distance,
wherein
a wavelength of the second light is longer than the wavelength of the first light,
the wavelength of the second light is longer 800 nm,
the second distance is longer than the first distance, and
the first distance and the second distance are each a distance from a skin in the depth direction;
wherein the deconvolution process uses a point spread function which is a circular symmetric function of distance from a z axis on the living body and is derived from the following equation:
P
(
ρ
)
=
3
P
o
(
4
π
)
2
{
(
μ
s
′
+
μ
o
)
+
(
k
o
+
1
ρ
2
+
d
2
)
d
ρ
2
+
d
2
}
exp
(
-
k
d
ρ
2
+
d
2
)
ρ
2
+
d
2
.Cited by (0)
No later patents cite this yet.
References (0)
No backward citations on record.